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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – The Fit Nation "Lucky 7" arrived in Hawaii on Sunday, May 13, for a week of training. The group will be participating in the Nautica Malibu Triathlon with CNN's Dr. Sanjay Gupta in September. Here they gather for a swim at Hapuna Beach. From left are Gupta, Glenn Keller, Rick Morris, Denise Castelli, Nancy Klinger, Carlos Solis, Adrienne LaGier and Jeff Dauler.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Gupta joins the "Lucky 7" for a swim as they train for their upcoming triathlon.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Keller does an open-water swim at Hapuna Beach.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Fit Nation producer Matt Sloane uses an aerial drone to capture video of the group in the water.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Keller treaded water for 26 straight minutes during a swim lesson in Hawaii, a very important survival skill. Now he takes a break for a beauty shot on the beach.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Klinger, LaGier and Morris emerge from the ocean after a long practice swim.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – LaGier walks back along Hapuna Beach after a successful open-water swim.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Gupta emerges from the Pacific Ocean after a training swim.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Gupta congratulates Morris on a job well done.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – The Fit Nation participants head off for a bike ride along the "Queen K" highway in Hawaii.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Gupta stays hydrated during the bike ride through the lava fields.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Castelli, a below-the-knee amputee, rides her bike through the lava fields.

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Photos:Training for a tri: 'Lucky 7 dives in'

Training for a tri: 'Lucky 7' dives in – Klinger and Dauler keep each other company on the bike ride with the team.